Top Voted Answer

Somewhere in the story the people in the church disappear and you are given a side-mission to find them. When you look inside the church, you find that Riddler's waiting on a projector. This starts the riddles and the ability to scan the riddle answers. Follow the riddles on the hostages to advance Riddler's storyline.3 years ago
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Answers

The 'scan' prompt only appears on certain missions (The watcher, Identity theft and deadshot victims). Other wise you have to just hold LB and it will take a 'snapshot' of your line of vision. You'll get some different results depending how close you are to solving a riddle.

No subject in area.Subject obscurredSubject too small (zoom with hitting RT)Subject not in line of sightPartial subject only (the big question marks, have to line up the top and bottom of ?)OR a riddle solved if you get the right object.3 years ago 10

If you're talking about scanning for evidence, as in when finding the bullet, the shot trajectory, entry point, wtc. then you only do that at specific parts in the game, when prompted to do so. It's only for missions that Batman declares a "crime scene."

You don't scan The Riddler's symbols; you either take a snapshot of them by holding LB, or you acquire the trophy. Taking a snapshot of a Trophy tags it, which puts it on your map. This way, if you find trophies that you aren't yet able to obtain or you don't feel like getting at the moment, you can mark them on your map to return to later.3 years ago 00